红宝石 |数组旋转！（）函数

Array#rotate!() : rotate!()是一个 Array 类方法，它返回 self 旋转到位，以便 count 的元素先出现，然后返回 self。

Syntax: Array.rotate!()

Parameter: Array

Return: self rotated in place so that the element at count comes first, and returns self.

示例 #1：

# Ruby code for rotate!() method
  
# declaring array
a = [18, 22, 33, nil, 5, 6]
  
# declaring array
b = [1, 4, 1, 1, 88, 9]
  
# declaring array
c = [18, 22, 50, 6]
  
# rotate! method example
puts "rotate!() method form : #{a.rotate!(1)}\n\n"
  
puts "rotate!() method form : #{b.rotate!(2)}\n\n"
  
puts "rotate!() method form : #{c.rotate!(-1)}\n\n"

输出 ：

rotate!() method form : [22, 33, nil, 5, 6, 18]

rotate!() method form : [1, 1, 88, 9, 1, 4]

rotate!() method form : [6, 18, 22, 50]

示例 #2：

# Ruby code for rotate!() method
  
# declaring array
a = ["abc", "nil", "dog"]
  
# declaring array
c = ["cat", nil]
  
# declaring array
b = ["cow", nil, "dog"]
  
# rotate! method example
puts "rotate!() method form : #{a.rotate!(1)}\n\n"
  
puts "rotate!() method form : #{b.rotate!(2)}\n\n"
  
puts "rotate!() method form : #{c.rotate!(-1)}\n\n"

输出 ：

rotate!() method form : ["nil", "dog", "abc"]

rotate!() method form : ["dog", "cow", nil]

rotate!() method form : [nil, "cat"]